add IE8-9 click-events-on-transparent-overlaid-elements bug to click event docs

Author: cvrebert

README.md

@@ -92,6 +92,8 @@ The following incompatibilities have been successfully documented in [MDN](https
   * https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Input$compare?to=588303&from=588017
 * [Firefox for Android border on `input[type="file"]`](https://github.com/twbs/bootstrap/issues/8702)
   * https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Input$compare?to=588351&from=588303
+* [IE8-9 `click` events on `transparent` overlaid elements bug](https://github.com/twbs/bootstrap/pull/11186)
+  * https://developer.mozilla.org/en-US/docs/Web/Reference/Events/click$compare?to=615503&from=402259
 
 Hopefully these edits will survive in some form and not get wholesale reverted.